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Talk:Check constraint

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This is an old revision of this page, as edited by Abdull (talk | contribs) at 15:34, 26 September 2012. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
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Added links to this page from:

http://en.wikipedia.org/wiki/Update_%28SQL%29

http://en.wikipedia.org/wiki/Insert_%28SQL%29

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http://en.wikipedia.org/wiki/Virtuoso_Universal_Server

This article currently has the following examples

Some examples of dangerous constraints include:
CHECK ((select count(*) from invoices where invoices.customerId = customerId) < 1000)
CHECK (dateInserted = CURRENT_DATE)
CHECK (countItems = RAND())

What is "dangerous" with these check constraints? --Abdull (talk) 15:34, 26 September 2012 (UTC)[reply]

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